Here's the macro builder screen, and I have NO idea where I'm to put this stuff:
If you download the sample db in that link and look at the code behind the forms (in the VBE - Visual Basic Editor) you will see how and where vb code is dealt with. That is also the answer in the 4th sentence of line two in your picture of text.
It cannot go into a macro. Macros are a separate thing where you click & select options and maybe type in some parameters in an attempt to do what code can do. However, macros are limited in comparison to code.
Let us know if the link is of no help and why.
Not sure I get why you say it's not working. It looks like you have a set of suppliers
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.